Electronic ignition system with lighting



Feb. 17, 1970 J. ALMENDRO DAVALILLO 3,495,579

ELECTRONIC IGNITION SYSTEM WITH LIGHTING Filed June 12, 1967 4Sheets-Sheet 1 Feb. 17, 1970 J. L- ALMENDRO DAVALILLO 3,495,579

I 4 ELECTRONIC IGNITION SYSTEM WITH LIGHTING Filed June 12, 1967 4Sheets-Sheet 2 V WT Feb, 17, 1970' J. 1.. ALME NDRd DAVALILLO 3,495,579

smc'monic ieui'rron SYSTEM WITH LIGHTING v 4 Sheets-Sheet 3 Filed June12, 1957 JJM r l j a T 4 J V jr j v5 v w V Feb. 17, 1970 L. ALM'ENbRboAv'AuLLo 3,495,579

ELECTRONIC IGNITION SYSTEM WITH LIGHTING Filed June 12, 1967 4Sheets-Sheet United States Patent 3,495,579 ELECTRONIC IGNITION SYSTEMWITH LIGHTING Jose Luis Almendro Davalillo, Madrid, Spain, assignor toFabrica Espanola Maguetos, S.A., Madrid, Spain, a

Spanish society Filed June 12, 1967, Ser. No. 645,340 Int. Cl. F02p1/00; Hb 37/02, 39/04 US. Cl. 123-149 5 Claims ABSTRACT OF THEDISCLOSURE The systems utilized to generate, in the form of a highvoltage, the energy necessary to produce the ignition of internalcombustion motors are well known.

There are systems employing a battery, such as the classic automobilesystem, based on the interruption of the current in the primary windingof a transformer coil.

There are systems which do not employ a battery, such as those utilizedin small motorcycles and aviation motors, operating by interruption ofthe primary current in the transformer coil, or by transference of thecurrent generated in a coil to the primary of a transformer coil, andalso that which stores energy in a condenser during the time in whichthe spark is not being produced, so that at the moment of suchproduction it may be transferred to the primary of a transformer coil.

Referring to the system mentioned third above, which is that which isnormally used in motorcycles, we find the following disadvantages: Speedlimit, 12,000 rpm; instability of the moment of ignition, variable from3 to 5 at the extreme margins; mechanical gap breaker.

In the system referred to fourth above these disadvantages are magnifiedsince the circuit breaker on being of the closure type is more affectedby the revolutions.

With the device which is the subject of this patent application, thefollowing advantages are obtained by comparison with the traditionalignition systems. The operation is purely electronic. There are nomechanical organs subject to Wear and tear, nor to any movement (exceptthe rotor), and all the circuits are calculated and projected withsafety margins which ensure an un limited life for the device as awhole.

Since there are no mechanical organs subject to wear and tear byfriction or other causes (as is the case with the cam-breaker mechanism,lubricating device, etc.), once the ignition hasbeen installed in themotor, no future checks are necessary since the certainty exists thatany breakdown in the motor is attributable to causes other than theignition.

For the same reason as that indicated above, the prov duction of thespark is effected always at the same point in each cycle, independentlyof the speed at whichthe motor is operated, thus eliminating theoscillations of the spark which may be produced at high speed by thetolerances existing inthe circuit breakers utilized in the 3,495,579Patented Feb. 17, 1970 hammer which may give rise to spark jumps in theadmission phase is also eliminated.

The system which forms the subject of the present invention also ensuresthat the carburization and the advance of the ignition are not socritical as in the traditional systems and it may be observed that themotor operates properly between relatively high limits.

The invention will be described by way of indication, reference beingmade to the first sheet of annexed drawings in which FIGURE 1 shows thestator 1 with an even number (2n-i-2) of cores 2 (in this case eight),on which the coils 3, 4, 5, 6, 7, 8,9, and 10 are fitted.

The 'cast aluminum rotor 11 has 2n magnets (in the case shown in thedrawing there are six magnets) 12 radially magnetized with thepolarities indicated, and six expansions 13 the magnets being' joined toa central yoke 14.

The circuit operates as follows:

As the rotor turns a flux is induced into the cores 2 at the end of onerevolution: this is shown in FIG- URE 2. This flux generates a voltage Valso shown in FIGURE 2. Similarly in the remaining cores of the stator,voltages analogous to V out-of-phase by corresponding polar angle, areintroduced. By connecting, for example, two coils which are separatedfrom one another by two polar units, for instance they coils 3 and 5, awave such as that shown in V is obtained, which wave, as may be seen,has two positive peaks and two negative peaks, one of each of thesepeaks being double the amplitude of the other. In this manner one singledefined signal (the high peak) is obtained for each revolution, whichsignal may be utilized as a synchronizing element for the purpose, forexample of triggering a controlled silicon diode which, connected to acondenser and an ignition coil produces the voltages necessary for theignition of an internal combustion engine.

FIGURE 3 shows the corresponding electric circuit, not limitative, ofthe ignition system with which the present patent is concerned. Forexample, in the cores 3 and 5 two coils may be used, one for chargingand the other for triggering, the charging coils connected to oneanother in opposition so that we obtain a wave like that indicated by Vin FIGURE 2, and the triggering coils, also connected in opposition butinverted withvrespect to the chargecoils, a wave equal to Y alsoshown-in FIG- URE 2, being'obtained. This voltage V suitably. filtered,gives rise to a voltage V (FIGURE 2.). with -an impulse V capable oftriggering the controlled idiode. i

Consequently thepeaky charges thecon'dense r'in accordance withthewav'eV 'whichdischarges at theinstant t into the coil, due to thetrigge'r 'irnpulse V ,-thus'producing, in the secondary winding of thehigh-tension coil a voltage peakV capable of effecting the ignition ofan internal combustion engine. e

If we connect up the coils'arranged in the places 4, 6, '8 and 10 weobtain a wave. V (see FIGURE 4); which as may be seen 'is completelysymmetrical, and capable of being used for thelighting system of thevehicle, or for charging a battery.

Analogously the rest of the coils. 7 and 9 maybe connected or utilizedindependently in order to obtain sup- I plementary. energy sources- Theconnection of the coils to one another is not limitative, and may beeffected in accordance with any combination according to the needs ofthe case. g n

A first variant is represented in FIGURES, in which a flywheel 1 'is'shown,.' constituted by ahoop of non-magnetic material 2, 2n expansions(six in thexample) 3, 4, 5, 6, 7 and 8 and three magnets 9, 10 andll thewhole complex being cast, for example in aluminium.

The stator 29 has a number of cores, 2n+2 (in the example shown inFIGURES eight of these cores are 3 included 14, 15, 16, 17, 18, 19, 20and 21) and the coils 13, 22, 23, 24, 25, 26, 27, and 28 are fitted tothe said cores.

The functioning is similar to that described above and indicated inFIGURE 2.

In a coil, for example that indicated by the number 22 a fiux is inducedby rotating the flywheel, as is shown in FIGURE 2. Consequently byconnecting two coils the distance between which is two polar units, thesame re sults as those described before are obtained for the interiorrotor. The remainder of the coils may be used as has been indicatedabove for the purposes of energising the lighting system or charging thebattery, either by connecting up all the coils which occupy an evenplace, thus obtaining a completely symmetrical wave, or by connecting upthe said coils in a suitable manner according to the necessities of theindividual circumstances.

A variant of the invention is described below and is represented inFIGURE 6, in which 1 and 2 represent two alternate coils, for example 24and 26 of FIGURE 5, and 3 a coil situated between the said coils, thatis to say that represented by 25 in FIGURE 5.

The voltage generated by the two coils 1 and 2 connected in accordancewith the diagram shown in FIGURE 6, has the form V of FIGURE 7, in thespecial case of the 8 poles in FIGURE 5, which charges the condenser 6through thediode 5 with the positive voltage peaks, the negative voltagepeaks being cut by the diode 4 which in this manner controls, by meansof the number of revolutions, the charging voltage of the condenser (seeFIGURE 7, V

The wave generated in 3 of FIGURE 6, shown as V in FIGURE 7, due to thefilter 9 and and to the diode 11 allows only the wave V of FIGURE 7 topass whose peak A is that produced by the triggering of the controlleddiode 8 which allows the oscillating discharge of the condenser 6 ofFIGURE 6 into the coil 7 with a return circuit through the diodes 4 and5.

The peak B of V of FIGURE 7, although capable of again triggering thecontrolled diode 8 is not important, since the condenser is dischargedand is without stored-up energy to produce the spark.

The remainder of the coils may be used to produce power for operating alighting system or for charging a battery.

A new variant of this invention is the case, for example, of the sixpoles indicated in FIGURE 8, in which one coil is used for charging andthe other for triggering, these coils being connected in accordance withthe diagram shown in FIGURE 9. Referring to FIGURE 8, 1 represents anon-magnetic counterweights, and 2 represents magnets, 3 representsextensions, cast in aluminium 4, all of this constituting the rotatoryflywheel. The stator 5 is formed by six radial cores 6 which carry thecoils 7, 8, 9, 10, 11, and 12.

As the flywheel turns, a flux such as that indicated by in FIGURE 10, isinduced, for example, into the core 6 corresponding to the coil 9: thisgenerates a voltage V represented in the said FIGURE 10, in the winding9. By connecting two of these coils, for example 10 and 11, inaccordance with the diagram shown in FIGURE 9, where the said coils arerepresented by 1 and 2 respectively, the result is that the diode 3 cutsthe negative part of the V and the diode 4 charges the condenser 5through the coil 6, in accordance with V of FIGURE 10.

Thus the voltage produced in the winding 11 of FIG- URE 8 represented by2 in FIGURE 9, has the form represented by V of FIGURE 10, which dulyfiltered by the resistance 7, the condenser 8 and the diode 9, producesin the trigger terminals of the control diode 10 a voltage peak such asA shown as V of FIGURE 10. This impulse consequently triggers thecontrolled diode 10, permitting the discharge of the condenser 5 throughthe coil 6 with a return circuit through the diodes 3 and 4 4, adischarge which produces the voltage V shown in FIGURE 10, in thesecondary winding.

A further variant of the invention is shown in FIGURE 11, in which, asmay be seen, six magnets 1 have been situated between each expansion 2,and in which, in addition, an expansion has been added as compared withthe previous case: that is to say there are 2+1 expansions with a statorof 2n+2 cores. The flux wave obtained in the core 3 in the course of onerevolution of the flywheel is that represented in FIGURE 12, whichproduces a voltage V in the winding corresponding to the said core.

By connecting, in this case, two coils separated from one another by apolar unit, we shall obtain a wave such as V likewise represented inFIGURE 12, susceptible to being used, as has been explained above, toeffect the process of ignition in a manner similar to that describedabove. In the said figure, the distance a corresponds to one turn.

The nature of the invention having been sufficiently described, as wellas the manner of putting it into practice, it is put on record that thearrangements of the elements indicated above are susceptible tomodification of detail, provided that such modifications do not alterthe fundamental principle of the invention.

I claim:

1. A magneto machine for generating charging pulse and a triggeringpulse for a capacitor discharge type ignition circuit having a chargingcircuit for the capacitor, and a discharging circuit for discharging thecapacitor through the primary of an ignition coil controlled by a gatedsolid state switch, said discharging circuit including a circuit fortriggering said gated switch, the improvement comprising:

a rotor;

a plurality of magnetic poles disposed angularly within said rotor;

a stator disposed in coaxial, rotational relationship with said rotor;

a plurality of coils disposed angularly within said stator, said coilsbeing responsive to the relative motion between said coils and saidmagnetic poles for developing individual time-related voltage waveformsfrom each of said coils, said plurality of coils including a first coilcomprising first and second coil segments, and a second coil comprisingfirst and second coil segments, said first segment of said first coilbeing connected to said first segment of said second coil inseries-opposing relationship, said first coil segments beinginterconnected with said charging circuit to produce a resultanttime-related voltage waveform generated from said connected first coilsegments in the form of a charging pulse for charging said capacitorprior to a predetermined discharging time, and said second segment ofsaid first coil being connected to said second segment of said secondcoil in series-opposing relationship, said second coil segments beinginterconnected with said discharging circuit of produce a resultanttime-related voltage waveform generated from said connected secondsegments in the form of a triggering pulse occurring at saidpredetermined discharge time, said triggering pulse being ap plied tosaid gated switch for discharging said capacitor at said predetermineddischarge time.

2. An electronic ignition system as in claim 1 wherein said plurality ofmagnetic poles and said plurality of coils are different in number.

3. An electronic ignition system as in claim 1, wherein said rotorrotates coaxially internal to said stator.

4. An electronic ignition system as in claim 1 wherein said chargingcircuit includes:

diode means for charging said capacitor to approximately the peak:positive voltage of said resultant time-related waveform and forpreventing discharge of said capacitor during negative transitions ofsaid References Cit d 5 Z wavefmn- UNITED STATES PATENTS n electronic1gn1t1on system as in 01am 1 wherein:

said charging circuit includes a resistor-capacitor net- 2,930,3263/1960 Dmgman 123-149 work for filtering said resultant time-relatedwave- 5 3,186,397 6/1955 Londonf 3,324,841 6/1967 Kebbon et a]. 123-149said gated switch is a controlled diode device responsive 3,358,66512/1967 Carmichael et to said filtered signal for discharging saidcapacitor;

and wherein LAURENCE M. GOODRIDGE, Primary Examiner said resultanttime-related waveform is generated by 10 combining said individualtime-related voltage wave- US Cl. X.R.

forms from said first and second coils separated from 315209 each otherby two polar positions.

